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seen Feb 23 '13 at 17:32

Feb
23
accepted Eliminating an inner sum for a double sum
Feb
23
comment Eliminating an inner sum for a double sum
@AndréNicolas L = floor(N/k) if that matters
Feb
23
asked Eliminating an inner sum for a double sum
Feb
23
accepted A way to simplify $\gcd(a,b)$ condition in a double sum?
Feb
22
accepted Reducing this sum to closed form
Feb
22
awarded  Commentator
Feb
22
comment Reducing this sum to closed form
See tinyurl.com/b9zw4nq
Feb
22
comment Reducing this sum to closed form
Do I absolutely have to multiply everything out? I had done so on Wolfram and it looked quite long and unreadable. You are saying I have to multiply it all out and then sum each piece separately?
Feb
22
revised Reducing this sum to closed form
edited tags
Feb
22
comment Reducing this sum to closed form
Please stop adding homework tags to my posts -- this is not homework
Feb
22
asked Reducing this sum to closed form
Feb
22
comment A way to simplify $\gcd(a,b)$ condition in a double sum?
@IvanLoh And how do you transform the (L+1-b) to that phi(n) expression in the third step? Where did b go?
Feb
22
comment A way to simplify $\gcd(a,b)$ condition in a double sum?
@IvanLoh Where does L^2+2 come from
Feb
22
awarded  Scholar
Feb
22
awarded  Editor
Feb
22
revised A way to simplify $\gcd(a,b)$ condition in a double sum?
added 151 characters in body
Feb
22
asked A way to simplify $\gcd(a,b)$ condition in a double sum?
Jul
2
comment Trying to find the name of this Nim variant
@StevenStadnicki My $S$ would be dynamic then, since there would be times when taking $x$ stones from the pile is OK in one instance but not in another, since the end result must be a part of $V$.
Jul
2
comment Trying to find the name of this Nim variant
@StevenStadnicki I vaguely understand it as the distance from winning position (a grundy number of 1 meaning you're one step away from a winning position or something to this effect). I am also not sure about periods, since my set $V$ has an exponential recurrence
Jul
2
comment Trying to find the name of this Nim variant
In my case, $V$ follows a recurrence. My issue is that I don't even know where to begin analyzing in order to develop a strategy that doesn't rely on brute scanning/trial and error/etc.